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Important notice: effective May 31, 2014, Gamespy will cease providing all hosted services for all games.

This is going to affect multiplayer in our games that use Gamespy for matchmaking, cd keys authentification and NAT traversal from Arma: Resistance to Arma 3. We are planning to introduce an alternative solution using Steam to Arma 2: Operation Arrowhead and Arma 3 users.

Other games (Take On Helicopters, Arma 2, Arma 2: Free, Arma, Arma: Cold War Assault) will have more limited multiplayer experience with loss of server browser, cd key authentification and NAT traversal systems. That said, direct IP connection to servers should work even after Gamespy services are no longer available.

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At the time of writing this post the Gamespy service still works and is available.

Itâ€™s now possible to activate all Arma 2 franchise keys on Steam. Just take the key from your manual and activate it on Steam ( https://support.steampowered.com/kb_article.php?ref=5414-TFBN-1352 ). This includes keys for Arma 2, Arma 2: Operation Arrowhead, Arma 2: British Armed Forces, Arma 2: Private Military Company, Arma 2: Army of the Czech Republic in all variants and editions (digital, retail, keys from Arma 2: Reinforcements and Arma X).

For other games (Arma 1, Arma: Cold War Assault, Take On Helicopters), which are not going to be updated to work with Steam, weâ€™ve prepared a set of FAQs ( http://faq.bistudio.com ) and a web-based server browser ( http://master.bistudio.com/ ). It enables server owners to add their servers to the list, for users to directly connect to the servers (if they have a Steam version of the game) or to easily learn how to connect. Currently itâ€™s in Alpha stage and weâ€™d like to improve the functionality.